Software for searching/securing/distributing PDF

According to its developer, QDocs is a powerful yet easy to use Document Management System that enables users to store, search and distribute source files like MS Office and PDF to anyone with a browser-equipped computer and web access. The program supports over 300 file types including native file handling of PDF, MS Office and Corel Office. Additonally, because Q-Docs does not "refry" incoming PDF's, all custom annotations made to those files remain untouched when the PDF goes into the system. Other capabilities include full text indexing of all incoming files, searching by XML Tag or by Text, optional DB management of the system by any browser-equipped system and interactive online help.